Connect to two networks simultaneously

Hi-

I have a windows XP client with two network cards: a wired card, and a wireless card. The wired card connects to an Intranet and the Internet (through a proxy). The wireless card connects directly to the Internet.

How can I configure my XP client to always go through the wireless connection for access to the Internet? Can I specify which specific sites are pulled from which connection?

Thank you,
HD